deriche: mse

codes/deriche/deriche.c

@@ -70,12 +70,12 @@ void calc_error(int w, int h,
     float *accurate = &_binary_data_bin_start;
     float *test = &(imgOut[0][0]);
 
+    /* calculate the mean squared error */
     for(i = 0; i < w*h; i++) {
-        err += fabs(accurate[i] - test[i])/accurate[i];
+        err += (accurate[i] - test[i])*(accurate[i] - test[i]);
     }
-
     err /= w*h;
-    printf("err is %f\n", err);
+    printf("error: %f\n", err);
 }